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Article: Checking your heat process on a budget, part 2: controllers, recorders and indicators.(Heating Highlights)
- Article from:
- Process Heating
- Article date:
- September 1, 2004
- Author:
CopyrightCOPYRIGHT 2004 BNP Media. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Continuing my discussion of how to check your heat process on a budget, I'll pick up with how to check the control circuits of electric heaters as well as how to manipulate test signals and analyze the results. I also will be covering controllers, recorders and indicators. Again, let me remind you: None of your tests must endanger the plant or its product.
[ILLUSTRATION OMITTED]
Electric Heaters. If there are no installed ammeters, put your clamp-on ammeter on the heater conductor. Check that current goes up and down as temperature goes down and up through setpoint. Without a sensor simulator, you cannot easily swing the temperature, so take the setpoint ...